1928 Radio Simplified: What It Is - How to Build And Operate The Apparatus.
1941. Radio Equipment. Sears, Roebuck and Co. Illustrated. Vintage Radios
46 issues of Radio News magazine 1927-1937. Hugh Gernsback; A. Lynch; L Cockaday
H & B Radio Catalogue No 85 (circa 1920s) Magnavox; Radiola; Howe Crystal Fada